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i) They're obviously pretty confident of their lightcurve readings, in the first place. This is still a fairly new measurement technique. They only have a total of six observations to go on at the moment, also.
ii) They're chasing only a few disequilibrium processes as a possible explanation. There could be others (?);
This seems to be a preliminary finding. Heaps more for them to do, and find out, methinks .
Let's face it … there's lots of things going on on the surface of this thing because of its close proximity to the star.
Cheers
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